Chapter11MassTransferapparatus-platetowersComparisonoftwotypesoftowersSelectionoftowertypePlate(tray)towerPlate(tray)towertypesofplatebubble-captraySievetrayFloatvalvetrayValvetraysFluidflowonfloatvalvesPressuredroponthevalveplatePressuredropthroughdryplate,hdPressuredropthroughliquid,hlAbnormaloperationconditionsWeepingWeepingBubbleormistentrainmentLiquidfloodLiquidfloodDesignoffloatvalvetowerHeightofthetowerDiameteroftowerCalculationofufSmith’sgraphNoteHerethestandardliquidinterfacetension=210-2N/mChecktheoverflowfloodTheresistanceheadofliquid,hcomesmainlyfromthelocalresistanceatthebottomgapofliquiddroppingtubeandcanbeevaluatedwithEq.